Aerosol-Generating Device Insulation Between Susceptor and Induction Coil
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Solution Overview
Problem
Existing aerosol-generating devices with induction heating arrangements face inefficiencies due to increased electrical resistance and heat loss, which affect operational efficiency and heating performance.
Innovation Solution
The device incorporates a thermally insulating element that prevents lateral airflow into the cavity while allowing axial airflow, along with a susceptor arrangement with permeable sidewalls and a controlled induction heating system using multiple induction coils and susceptors to optimize airflow and heating efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If induction heating is used to heat the aerosol-generating article, then heating efficiency is improved, but the induction coil temperature increases leading to increased electrical resistance and reduced operational efficiency
Solution Approach 1:
The cavity is divided into thermally isolated zones using insulating elements. The insulating element separates the heating chamber from the induction coil housing, creating distinct thermal zones that prevent heat transfer to the coil housing while maintaining efficient heating in the chamber.
Solution Approach 2:
A thermally insulating element is introduced as an intermediary between the heating chamber and the induction coil housing. This insulating element acts as a thermal barrier that prevents direct heat transfer to the coil housing, thereby maintaining operational efficiency while preserving heating efficiency.
2Temperature
If the induction coil temperature increases, then heating capability is improved, but electrical resistance increases reducing operational efficiency
Solution Approach 1:
Thermal insulation is provided in advance to prevent excessive temperature increase of the induction coil. The insulating element is positioned to cushion the coil housing from thermal exposure during operation, maintaining electrical resistance at acceptable levels while allowing the heating chamber to reach required temperatures.
3Loss of energy
If thermal insulation is improved, then heat loss is reduced, but device complexity increases
Solution Approach 1:
A thin-walled insulating element is used to provide thermal insulation without adding significant structural complexity. The insulating element can be made from materials like PEEK or PTFE that provide effective thermal barriers in thin configurations, reducing heat loss while maintaining a simple device structure.
4Loss of energy
If airflow control is improved, then heating efficiency is improved, but device complexity increases
Solution Approach 1:
The susceptor arrangement features locally differentiated properties with permeable sidewalls in specific regions to control airflow. The blade-shaped susceptors have gaps between them that allow air passage, creating localized airflow control zones that improve heating efficiency without requiring complex overall device architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances thermal insulation, improves airflow distribution, and allows for precise temperature control, resulting in improved operational efficiency and heating performance of the aerosol-generating device.
Implementation Method 1
The induction coil may be arranged surrounding the susceptor arrangement. During operation, heating of the susceptor arrangement may lead to an increase of temperature of the induction coil
Implementation Method 2
For induction heating, the heating arrangement may comprise an induction coil and a susceptor arrangement
Implementation Method 3
a thermally insulating element (22) is arranged between the cavity (10) and the induction coil (16)
Implementation Method 4
The air aperture arranged in the base enables axial airflow into the cavity. The airflow into the cavity is enabled in an axial direction
Data Source
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AI summary
The invention relates to an aerosol-generating device comprising a cavity (10) for receiving an aerosol-generating article (12) comprising aerosol-forming substrate (18). The cavity comprises a base (28). The base comprises at least one air aperture (30). The device further comprises an induction heating arrangement. The induction heating arrangement comprises a susceptor arrangement (14) and an induction coil (16). The induction heating arrangement is arranged at least partly surrounding or forming the cavity. The device further comprises a thermally insulating element (22). The thermally insulating element is arranged between the susceptor arrangement and the induction coil. The thermally insulating element is sealingly attached to the base to prevent lateral airflow into the cavity at the base of the cavity.